#region License
/*
* Copyright 2002-2008 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#endregion
using System;
using System.Reflection;
using Spring.Util;
namespace Spring.Aop.Support{
/// <summary>
/// MethodMatcher that looks for a specific attribute being present on the
/// method (checking both the method on the onviked interface, if any and the corresponding
/// method on the target class
/// </summary>
/// <author>Juergen hoeller</author>
/// <author>Mark Pollack</author>
/// <seealso cref="AttributeMatchingPointcut"/>
[Serializable]
public class AttributeMethodMatcher : StaticMethodMatcher
{
private readonly Type attributeType;
/// <summary>
/// Initializes a new instance of the <see cref="AttributeMethodMatcher"/> class for the
/// given atribute type.
/// </summary>
/// <param name="attributeType">Type of the attribute to look for.</param>
public AttributeMethodMatcher(Type attributeType)
{
ValidateAttributeTypeArgument(attributeType);
this.attributeType = attributeType;
}
/// <summary>
/// Does the supplied <paramref name="method"/> satisfy this matcher?
/// </summary>
/// <param name="method">The candidate method.</param>
/// <param name="targetType">The target <see cref="System.Type"/> (may be <see langword="null"/>,
/// in which case the candidate <see cref="System.Type"/> must be taken
/// to be the <paramref name="method"/>'s declaring class).</param>
/// <returns>
/// <see langword="true"/> if this this method matches statically.
/// </returns>
/// <remarks>
/// <p>
/// Must be implemented by a derived class in order to specify matching
/// rules.
/// </p>
/// </remarks>
public override bool Matches(MethodInfo method, Type targetType)
{
if (method.IsDefined(attributeType, true))
{
// Checks whether the attribute is defined on the method or a super definition of the method
// but does not check attributes on implemented interfaces.
return true;
}
else
{
Type[] parameterTypes = ReflectionUtils.GetParameterTypes(method);
// Also check whether the attribute is defined on a method implemented from an interface.
// First find all interfaces for the type that contains the method.
// Next, check each interface for the presence of the attribute on the corresponding
// method from the interface.
foreach (Type interfaceType in method.DeclaringType.GetInterfaces())
{
MethodInfo intfMethod = interfaceType.GetMethod(method.Name, parameterTypes);
if (intfMethod != null && intfMethod.IsDefined(attributeType, true))
{
return true;
}
}
return false;
}
}
private static void ValidateAttributeTypeArgument(Type attributeType)
{
AssertUtils.ArgumentNotNull(attributeType, "attributeType");
if (!typeof(Attribute).IsAssignableFrom(attributeType))
{
throw new ArgumentException(
string.Format(
"The [{0}] Type must be derived from the [System.Attribute] class.",
attributeType));
}
}
}
}
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